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代码编辑器:
<!DOCTYPE html> <meta charset="utf-8"> <link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> <script src="https://cdn.staticfile.org/jquery/2.2.4/jquery.min.js"></script> <script> $(document).ready(function(){ $("button").click(function(){ alert($(".hot").index($("#favorite"))); }); }); </script> <p>单击按钮来获得id =“favorite”的元素的索引,相对于jQuery选择器(类=“hot”):</p> <button>获取下标</button> <ul> <li>Milk</li> <li class="hot">Tea</li> <li class="hot" id="favorite">Coffee</li> </ul> <footer>简单教程,简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
运行结果: